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HP 2649 B/C Terminals

These are terminals that I purchased from a fellow user and collected in person during my Idaho road trip.
There were two units. The first one is a 2649B which when opened is fully populated and fitted with an HP-IB option.
The other is a 2649C which states it was specifically a graphics terminal. Unfortunately it had all its boards pulled and the safety glass took a good hit and broke plus the case plastics are trashed but it still has a good power supply, analog board, CRT and two salvageable tape drives. The only reason I grabbed it as well is in the hopes that I can trade it for a keyboard for the 2649B as neither came with a keyboard.
In fact I cannot find any documentation or mention directly of the B/C models. I can find the A and D models only. Also holy crap there are a ton of models of this terminal that look identical.

Anyone here ever heard of them specifically and moreso, is anyone willing part or all of the 2649C carcass for a keyboard?

If I counted correctly the last time I look a year or so ago, I currently have the following:
(2x) 2640B
(4x) 2645A
(6x) 2645A with dual CTU
(1x) 2647F with dual floppy (most interesting one, it runs BASIC locally)
13 terminals total and only 7 keyboards.

So I wouldn't need any more carcasses myself as I already have more terminals than keyboards.

Looks like the main differences between any of the models of this terminal family is whether or not they have the built-in tape drives, and the particular set of CPU, video, memory, and I/O boards, and firmware that are installed. As you say there were a large number of permutations sold as different models.

It looks to be a complete computer in here. I am however heeding the warning for the similar model units and have not yet powered it in, though that still won't do much without a keyboard.

Speaking of which, in order to get the other terminal home I had to dismantle it. The case was really beat up from someone trying to figure out how to pry it open before realizing there's a catch on either side. The machine broke down into two small bundles, the deflection yoke and the CRT which I packed in a custom carton. It's all still available if someone wants to trade.

I do have an extra 264x keyboard. I just need to check so I can get my 2640 and 2645 together. It will take a while. In case you can wait for me to get all together and test them. That little lid over the baud rate switch is of course missing though...